Natural Fitness Balance Disc

The Natural Fitness Balance DiscThis inflatable disc allows you to enjoy the advantages of an exercise ball in a small portable product. Use it in your exercise routine to improve balance, strength and stability. As an additional benefit, sitting on a balance disc placed on top of your chair helps achieve better posture by engaging core muscles. Non-toxic, phthalate-free material.

I purchased it to be used while sitting at my desk to stablilize and train my core muscles in resting. It does keep you focused on sitting up straight. The only negative is that when i used it at home with a wicker chair it rubbed off the paint of the chair. Overall a good, useful purchase.